Grey literature (or gray literature) is materials and research produced by organizations outside of the traditional commercial or academic publishing and distribution channels. Common grey literature publication types include reports (annual, research, technical, project, etc.), working papers, government documents, white papers and evaluations. Organizations that produce grey literature include:
Phillips, K., Woods, S., & Dudash, A. (2023). Incorporating gray literature in an evidence-based nursing curriculum: A how-to-guide.
portal: Libraries and the Academy, 23(3), 517-535. https://doi.org/10.1353/pla.2023.a901566